Don't worry about messy chemicals or microwavable heat packs; the PORTABLE Thermalution
F.I.R. Heated Elbow Wrap comes with a long-lasting, rechargeable battery pack that
provides up to 5 hours of constant heat. Great for use at home or while traveling, this
Elbow Wrap has a temperature on/off and comes with a convenient home charger.

Far iInfrared ray (FIR) is a spectrum of natural sunlight with a wavelength of 4 
1000 microns. It is invisible to the human eyes.

The National Aeronautics and Space Administration (NASA) pointed out that FIR with
wavelength between 6  14 microns is capable of penetrating deep into the human body
where they gingerly elevate the body temperature and generate resonance. It can accelerate
metabolism, improve circulation and provide warmth.

Testing of Petatech® International Co., Ltd. products, performed by Chung-Shan
Institute of Science and Technology, demonstrates that all of Petatechs products
generate the desired FIR with wavelength of between 6-14 microns.